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authorDaniel T. Lee <danieltimlee@gmail.com>2019-04-04 07:17:56 +0900
committerDaniel Borkmann <daniel@iogearbox.net>2019-04-04 16:43:47 +0200
commite67b2c715415b121339049b630f0b4e1ede888dc (patch)
treeead14552f2199aca864d04cdff0afcd23222eaf9 /samples/bpf/spintest_user.c
parent0979ff7992fb6f4eb837995b12f4071dcafebd2d (diff)
downloadlinux-stericsson-e67b2c715415b121339049b630f0b4e1ede888dc.tar.gz
samples, selftests/bpf: add NULL check for ksym_search
Since, ksym_search added with verification logic for symbols existence, it could return NULL when the kernel symbols are not loaded. This commit will add NULL check logic after ksym_search. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'samples/bpf/spintest_user.c')
-rw-r--r--samples/bpf/spintest_user.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/samples/bpf/spintest_user.c b/samples/bpf/spintest_user.c
index 8d3e9cfa1909..2556af2d9b3e 100644
--- a/samples/bpf/spintest_user.c
+++ b/samples/bpf/spintest_user.c
@@ -37,8 +37,13 @@ int main(int ac, char **argv)
bpf_map_lookup_elem(map_fd[0], &next_key, &value);
assert(next_key == value);
sym = ksym_search(value);
- printf(" %s", sym->name);
key = next_key;
+ if (!sym) {
+ printf("ksym not found. Is kallsyms loaded?\n");
+ continue;
+ }
+
+ printf(" %s", sym->name);
}
if (key)
printf("\n");